From brilliant blues to fiery reds, discover how nature crafts diamonds in every color, and why some shades are rarer than ...

Laid out like an orchestra in a quiet gallery room, 40 colorful gems have one of the planet’s most distinguished conductors: ...

Chalcedonies include many types of cryptocrystalline quartz gems and feature a number of different colors. Geologists can tell a chalcedony from the arrangement and structure of its crystals.

Take a leisurely hike along one of the many scenic trails ... seek out the hidden gems of America. The colors of autumn truly shine. From the peaceful forests of the Great Smoky Mountains to ...